Keyhole-guard.



E. E. CURTISS.

KEYHOLE GUARD. APPLICATION FILED JAN. 25. 1917.

Patanted Apr. 24, 1917.

ED ELIS CURTISS, 0F SPOKANE, WASHINGION.

KEYHOLE-GUARD.

Specification of Iietters Patent. at t 24, 19 7,

Application filed J'anuary 25, 1917. Serial No. 144,482.

T0 all wfiom z't mdy conoern:

Be it known that I, En E. CURTISS, a citizen of the United States, resding at Spokane,in the cCunty of Spokaneand State of YVashington, have invented certain new and useful Improvements in Keyhole-Guards, of vvhich the following is a specification, reference beirog had to the accompanying draw 1ngS.

Tliis invention relates to certain improve ments in key hole guards and it is an object of the invention to provide a novel and improved device of this general oharacter 'wherein a key is eiectively held against removalfrom the look so that the insertion of a second key or other implement for adjuSting the look ito an open position is efiectively prevented. n 4

The invention also has for an object to provide a novel and improVed devioe of this general oharacter which serves t0 Substantially close the key hole in a door or the like to prevent visual access being had through the key hole.

The invention consists in the details of construction and in the combination and arrangement of the several parts of my improved key hole guard whereby certain important advantages are attained and the device is rendered sih1pler, less expensive and otherwise more convenient and advanta geous for use, all as Will be hereinafter more fully set forth.

The novel features of the invention Will hereinafter be definitely claimed.

In order that mv invention may be the better understood, I Will now prooeed t0 describe the same with reference to the accompanying drawings, wherein' Figure 1 is a fragmentary view in elevation of a fragment of a .key hole or escutch eon plate showing certain features of my invention with the coacting key indicated in section and in locked position;

Fig. 2 is a vertical sectional view taken through the device. as shown in Fig. 1 with the key shown in initial position;

Fig. 3 is an inside elevational view of cer-' tain parts of my improved guard as herein embodied, the lever plate being indicated by dotted limes;

Fig. 4: is a view in inside elevation of the guide plate as her-ein e1hbodied; and

Fig. 5 is an elevational view of the lever plate as herein employed.

As disclosed in the accompanying drawings, P denotes a key hole or escutcheon plate of predetermined dimensions and configura tion and which is provided with the key hole 1 through which is adapted to beinserted a conventional key for adjusting a look into either open or closed position.

Secured to the surface of the door or the like immediately adjacent the plate P is the guide plate 2 disposed transversely of the plate P and provided vvith the key hole 3 in register With the key hole 1 heinbefore referred to. The upper and lovver marginal portions of the plate 2 are provided with the flanges 4: extending in a direction toward the plate P and between Which is adapted to slide the locking plate 5. 1

The locking plate 5 is also providedwitli the key hole 6 adapted to register with the holes 1 and 3 so that a key may be inserted threthrough to have proper coaction with a look mechanism, said key being preferably of a type including a blade B and a shank angular in cross section as illstrated in Fig. 1 of the acoompanying drawings. The enlarged or upper portion of the key hole6 has in communication therewith the perpendicularly related slot 7 preferably extending to theleft, although I do not wishto be understood as limiting myself in this par tioular respect.

After the blade B 01'' the key has been inserted through the registering openings to adjust the look 1hecl1anism into operative position the blade B Will be substantially horizontal and when the locking plate 5 is moved toWard the right the shank S of the key Will be received within the slot 7, whereby it Will be peroeived that the key is efiectively held against removal. It Will also be at once selfevident that When the plate 5 is moved'toward the right the opening 6 therein Will be adjusted out of register with the openings 1 and 3, whereby said openings are efiectively closed against visual access.

K denotesa knob provided at one end with a shank 8, the inner end portion of said shank being circular in cross section so that the knob may be rotatably engaged with the plate P. The shank 8 extends through the plate P and has its free end portion angular in cross section, as indicated at 9, and vvhich is adapted to extend Within a correspondingly formed opening 10 produced in the lever plate 11 adjacent an end of said plate. The plate 11 is preferably vertically disposed and its lower end Portion overlies the upper marginal portion of the plate 5 and said plate 5 is provided with an enlarged opening or slot 12 adapted to loosely receive the pin 14 or the like carried by the overlying portion of the lever plate 11 whereby it Will be at once self-evident that the desired slicling mdvement may loe imparted to the plate 5 upon requisite rotation of the knob K.

Froin the foregoing description, it is thought to be obvious that a key hole guard constructed in accordance with my invention is of an extremely simple and compara tively inexpensive nature and is particularly well adapted for use by reason of the convenience and facility with which it may be assembled, and it Will also be obvious that my invention is susceptible of some change and modification without material departure from the principles and spirit thereof and for this reason I do not wish to be understood as limiting myself to the precise arrangement and formation of the several parts herein shown in carrying out my* invention in practice, except as hereinafter .claimed.

I claim:

1. In combination with a plate provided with a key hole, a plate slidably supported rearwarclly of the first nzimecl plate and provided with a key hole adapted to register xvith the key hole of the first named plate, said second named plate being also provided with a slot in communication with the key hole opening at an end thereof, said slot being angularly related to the key hole and adapted to receive the shank of a key When said second named plate is moved in one direction, a lever plate mounted for rocking movement and having an end portion overlying the second named plate, means for rocking the lever plate, and a pin carried by the overlying portion of the lever plate, said second plate being provided with an opening loosely receiving said pin.

2. In combination with a plate provided with a key hole, a guide plate supported ad jacent the first named plate and provided with a key hole in register With the key hole of the first named plate, a locking plate slid ably engagecl with the guide plate, said looking plate being provided with a key hole adapted to register with the key holes in the first two named plates, said locking plate being also provided rvith a slot in communication with an end portion of the key hole therein, said slot being also angular*ly related to the key hole and adapted to receive the shank of a key When said second na1ned plate is moved in one direction, a lever plate mounted for rocking movement and having a portion overlying the locking plate, means for rocking the lever plate, and a pin carriecl by the overlying portion of the lever plate, said locking plate being provided with an opening to loosely receive the pin of the lever plate.

In testimony whereof I hereunto affiX my signature in the presence of two witnesses.

ED ELIAS CURTISS.

Witnesses:

HENRY SEDDON Davms, STEPHEN T. BONNER.

Copies of this patent may be obtanedor five cents each, by addressing the Commssioner of Patents,

Washington, 1). C. 

